Display screen or portion thereof with graphical user interface having a pop-up element



The FIGURE is a front view of a display screen or portion thereof with a graphical user interface having a pop-up element. The broken line showing of text, lines, boxes, and graph elements illustrate portions of the graphical user interface and form no part of the claimed design. 

CLAIM The ornamental design for a display screen or portion thereof with graphical user interface having a pop-up element, as shown and described. 